EP2509550A1 - Thermal management algorithm for phacoemulsification system - Google Patents
Thermal management algorithm for phacoemulsification systemInfo
- Publication number
- EP2509550A1 EP2509550A1 EP10788463A EP10788463A EP2509550A1 EP 2509550 A1 EP2509550 A1 EP 2509550A1 EP 10788463 A EP10788463 A EP 10788463A EP 10788463 A EP10788463 A EP 10788463A EP 2509550 A1 EP2509550 A1 EP 2509550A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- thermal value
- power
- controller
- control system
- calculated
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000002262 irrigation Effects 0.000 claims abstract description 69
- 238000003973 irrigation Methods 0.000 claims abstract description 69
- 230000007423 decrease Effects 0.000 claims abstract description 48
- 239000012530 fluid Substances 0.000 claims abstract description 45
- 210000000695 crystalline len Anatomy 0.000 description 15
- 230000003247 decreasing effect Effects 0.000 description 13
- 238000001356 surgical procedure Methods 0.000 description 12
- 208000002177 Cataract Diseases 0.000 description 8
- 238000010586 diagram Methods 0.000 description 8
- 238000010438 heat treatment Methods 0.000 description 7
- 206010015911 Eye burns Diseases 0.000 description 6
- 210000004087 cornea Anatomy 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 239000013078 crystal Substances 0.000 description 3
- 239000012634 fragment Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 210000002159 anterior chamber Anatomy 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000000994 depressogenic effect Effects 0.000 description 2
- 238000005316 response function Methods 0.000 description 2
- 210000001525 retina Anatomy 0.000 description 2
- 238000002604 ultrasonography Methods 0.000 description 2
- 206010063341 Metamorphopsia Diseases 0.000 description 1
- 239000002775 capsule Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000881 depressing effect Effects 0.000 description 1
- 230000003292 diminished effect Effects 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 229940113601 irrigation solution Drugs 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F9/00—Methods or devices for treatment of the eyes; Devices for putting-in contact lenses; Devices to correct squinting; Apparatus to guide the blind; Protective devices for the eyes, carried on the body or in the hand
- A61F9/007—Methods or devices for eye surgery
- A61F9/00736—Instruments for removal of intra-ocular material or intra-ocular injection, e.g. cataract instruments
- A61F9/00745—Instruments for removal of intra-ocular material or intra-ocular injection, e.g. cataract instruments using mechanical vibrations, e.g. ultrasonic
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M1/00—Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems
- A61M1/71—Suction drainage systems
- A61M1/77—Suction-irrigation systems
- A61M1/772—Suction-irrigation systems operating alternately
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B2017/00017—Electrical control of surgical instruments
- A61B2017/00022—Sensing or detecting at the treatment site
- A61B2017/00084—Temperature
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/32—Surgical cutting instruments
- A61B17/320068—Surgical cutting instruments using mechanical vibrations, e.g. ultrasonic
- A61B2017/320084—Irrigation sleeves
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M2205/00—General characteristics of the apparatus
- A61M2205/33—Controlling, regulating or measuring
- A61M2205/3368—Temperature
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M2210/00—Anatomical parts of the body
- A61M2210/06—Head
- A61M2210/0612—Eyes
Definitions
- the present invention relates to phacoemulsification surgery and more particularly to a thermal management algorithm in which the amplitude of power applied to a phacoemulsification hand piece is varied in proportion to temperature.
- the human eye functions to provide vision by transmitting light through a clear outer portion called the cornea, and focusing the image by way of a crystalline lens onto a retina.
- the quality of the focused image depends on many factors including the size and shape of the eye, and the transparency of the cornea and the lens.
- vision deteriorates because of the diminished light which can be transmitted to the retina.
- This deficiency in the lens of the eye is medically known as a cataract.
- An accepted treatment for this condition is surgical removal of the lens and replacement of the lens function by an artificial intraocular lens (IOL).
- IOL intraocular lens
- the majority of cataractous lenses are removed by a surgical technique called phacoemulsification.
- a typical surgical hand piece suitable for phacoemulsification procedures consists of an ultrasonically driven phacoemulsification hand piece, an attached hollow cutting needle surrounded by an irrigating sleeve, and an electronic control console.
- the hand piece assembly is attached to the control console by an electric cable and flexible tubing. Through the electric cable, the console varies the power level transmitted by the hand piece to the attached cutting needle.
- the flexible tubing supplies irrigation fluid to the surgical site and draws aspiration fluid from the eye through the hand piece assembly.
- the operative part in a typical hand piece is a centrally located, hollow resonating bar or horn directly attached to a set of piezoelectric crystals.
- the crystals supply the required ultrasonic vibration needed to drive both the horn and the attached cutting needle during phacoemulsification, and are controlled by the console.
- the crystal/horn assembly is suspended within the hollow body or shell of the hand piece by flexible mountings.
- the hand piece body terminates in a reduced diameter portion or nosecone at the body's distal end.
- the nosecone is externally threaded to accept the hollow irrigation sleeve, which surrounds most of the length of the cutting needle.
- the horn bore is internally threaded at its distal end to receive the external threads of the cutting tip.
- the irrigation sleeve also has an internally threaded bore that is screwed onto the external threads of the nosecone.
- the cutting needle is adjusted so that its tip projects only a predetermined amount past the open end of the irrigating
- the tip of the cutting needle and the end of the irrigation sleeve are inserted into the anterior capsule of the eye through a small incision in the outer tissue of the eye.
- the surgeon brings the tip of the cutting needle into contact with the lens of the eye, so that the vibrating tip fragments the lens.
- the resulting fragments are aspirated out of the eye through the interior bore of the cutting needle, along with irrigation solution provided to the eye during the procedure, and into a waste reservoir.
- irrigating fluid is pumped into the eye, passing between the irrigation sleeve and the cutting needle and exiting into the eye at the tip of the irrigation sleeve and/or from one or more ports, or openings, cut into the irrigation sleeve near its end.
- the irrigating fluid protects the eye tissues from the heat generated by the vibrating of the ultrasonic cutting needle. Furthermore, the irrigating fluid suspends the fragments of the emulsified lens for aspiration from the eye.
- Power is applied to the hand piece to vibrate the cutting needle.
- the amplitude of needle movement is proportional to the power applied.
- the needle vibrates back and forth producing a longitudinal needle stroke.
- the needle may be caused to vibrate in a twisting or torsional motion. Regardless of the type of vibration, the magnitude of vibration (or amplitude of needle stroke) varies with applied power.
- the inventors have found that this heating is dependent on three basic factors: the amount of power applied to the hand piece (which in turn determines the magnitude of needle vibration or amplitude of needle stroke); the amount of fluid flow through the eye (since the fluid carries heat away); and the amount of friction between the needle and the surrounding sleeve at the incision (as can be appreciated, the tighter the fit between the sleeve and the needle, the more friction, and the more heat produced as the needle vibrates).
- heat is produced at the corneal incision as the cutting needle rubs against the surrounding irrigation sleeve.
- This heat is normally dissipated by fluid flowing through irrigation sleeve, into the anterior chamber of the eye, and out of the eye through the aspiration lumen.
- the friction between the cutting needle and the sleeve at the corneal incision site can vary depending on the characteristics of the incision. Generally, a smaller incision (which is desirable from a surgical perspective) can lead to a greater friction force between the needle and the sleeve as the walls of the incision press the sleeve against the needle. In such a case, when the needle is vibrated, heat is produced.
- Corneal burns are problematic because they distort the cornea resulting in distorted vision. Since cataract surgery has gravitated toward smaller and smaller incisions, the risk of corneal burns appears to be increasing.
- the present invention is a control system for managing power supplied to a
- the control system includes an irrigation pressure sensor, a power source that provides power to the hand piece, and a controller that controls the power source.
- the controller calculates a thermal value based on the irrigation pressure and a power level and decreases the power level in proportion to the calculated thermal value when the calculated thermal value exceeds a threshold thermal value.
- the present invention is a control system for managing power supplied to a
- the control system includes a power source that provides power to the hand piece and a controller that controls the power source.
- the controller calculates a thermal value based on irrigation fluid flow and a power level and decreases the power level in proportion to the calculated thermal value when the calculated thermal value exceeds a threshold thermal value. Irrigation fluid flow can be calculated from an irrigation pressure.
- Figure 1 is a diagram of the components in the fluid path of a phacoemulsification system.
- Figure 2 is a perspective view of the distal end of a phacoemulsification needle and irrigation sleeve.
- Figure 3 is a diagram of a partial system according to the principles of the present invention.
- FIG. 4 is a block diagram of one embodiment of a control system according to the principles of the present invention.
- Figure 5 is a block diagram of another embodiment of a control system according to the principles of the present invention.
- Figure 6 is a graph depicting an exemplary operation of the thermal management algorithm in continuous mode according to the principles of the present invention.
- Figure 7 is a graph depicting an exemplary operation of the thermal management algorithm in pulse mode according to the principles of the present invention.
- Figure 8 is a graph depicting an exemplary operation of the thermal management algorithm in pulse mode according to the principles of the present invention.
- Figure 9 is a graph depicting an exemplary operation of the thermal management algorithm in burst mode according to the principles of the present invention.
- Figure 10 is a graph depicting an exemplary operation of the thermal management algorithm in burst mode according to the principles of the present invention.
- Figure 1 is a diagram of the components in the fluid path of a phacoemulsification system.
- Figure 1 depicts the fluid path through the eye 1 145 during cataract surgery.
- the components include an irrigation fluid sourcel 105, an irrigation pressure sensor 1 130, an irrigation valve 1 135, an irrigation line 1 140, a hand piece 1 150, an aspiration line 1 155, an aspiration pressure sensor 1 160, a vent valve 1165, a pump 1 170, a reservoir 1 175 and a drain bag 1 180.
- the irrigation line 1140 provides irrigation fluid to the eye 1 145 during cataract surgery.
- the aspiration line 1155 removes fluid and emulsified lens particles from the eye during cataract surgery.
- irrigation fluid When irrigation fluid exits irrigation fluid source 1105, it travels through irrigation line 1 140 and into the eye 1145.
- An irrigation pressure sensor 1130 measures the pressure of the irrigation fluid in irrigation line 1 140.
- An optional irrigation valve 1 135 is also provided for on/off control of irrigation.
- Irrigation pressure sensor 1130 is implemented by any of a number of commercially available fluid pressure sensors and can be located any where in the irrigation fluid path (any where between the irrigation source 1 105 and the eye 1 145).
- a hand piece 1 150 is placed in the eye 1 145 during a phacoemulsification procedure.
- the hand piece 1150 has a hollow needle (as seen in Figure 2) that is ultrasonically vibrated in the eye to break up the diseased lens.
- a sleeve located around the needle provides irrigation fluid from irrigation line 1 140.
- the irrigation fluid passes through the space between the outside of the needle and the inside of the sleeve (as more clearly shown in Figures 12 and 13). Fluid and lens particles are aspirated through the hollow needle.
- the interior passage of the hollow needle is fluidly coupled to aspiration line 1155.
- Pump 1170 draws the aspirated fluid from the eye 1 145.
- An aspiration pressure sensor 1 160 measures the pressure in the aspiration line.
- An optional vent valve can be used to vent the vacuum created by pump 1170.
- the aspirated fluid passes through reservoir 1 175 and into drain bag 1 180.
- FIG. 2 is a perspective view of the distal end of a prior art phacoemulsification hand piece.
- a phacoemulsification needle 1210 is surrounded by an irrigation sleeve 1230.
- the phacoemulsification needle 1210 has an open end 1220 through which lens particles are aspirated from the eye during cataract surgery.
- the irrigation sleeve 1230 has an optional opening 1240 through which irrigation fluid flows into the eye.
- the needle 1210 and sleeve 1230 are both inserted into the anterior chamber of the eye during cataract surgery. When power is applied to the hand piece, the needle 1210 vibrates ultrasonically. Friction between the needle 1210 and the sleeve 1230 can cause heating to occur - particularly at the incision site.
- FIG 3 is a diagram of a partial system according to the principles of the present invention.
- irrigation fluid source provides irrigation fluid to hand piece 1 150.
- An irrigation pressure sensor measures the pressure of the irrigation fluid.
- a power source 120 provides power to hand piece 1150. As previously described, power source 120 provides ultrasonic power to hand piece 1 150 that vibrates the phacoemulsification needle.
- FIG 4 is a block diagram of one embodiment of a control system according to the principles of the present invention.
- CPU 1 16 is coupled to power source 120 and irrigation pressure sensor 1130. In this manner, CPU 116 receives pressure information from irrigation pressure sensor 1 130.
- CPU 1 16 also interfaces with power source 120 and controls its operation - thereby controlling the power sent to the hand piece. As previously described, CPU 1 16 can be any suitable controller.
- the amount of heat generated is a function of the amount of power applied to the hand piece and the amount of irrigation fluid flow through the eye. Friction between the irrigation sleeve and the phacoemulsification needle is the primary source of heat. When the needle rubs against the sleeve, it produces heat.
- the amount of power applied to the hand piece is linearly related to the needle stroke - or the distance the needle travels. The more power applied, the more the needle travels (and the more the needle rubs against the sleeve).
- the coefficients 'Go' and 'a' can be determined to best fit the coefficient of friction (between the sleeve and the needle) and experimental data on ⁇ under various flow and power conditions.
- the calculated thermal value (T) is a function of: the power (P) applied to the hand piece, the fluid flow (F) through the eye, and the friction (Fr) between the needle and the sleeve.
- This calculated thermal value is used to implement a thermal watch algorithm. Since the calculated thermal value provides a good estimate of the actual temperature, a threshold thermal value can be set to trigger the algorithm. In other words, when the calculated thermal value exceeds the threshold thermal value, the algorithm can act to reduce the likelihood of heating (by decreasing power).
- the calculated thermal value is used as an input to control the amount of power provided to the hand piece.
- the actual power applied to the hand piece tracks the inverse of the calculated thermal value when the calculated thermal value exceeds the threshold thermal value.
- the threshold thermal value (or the value above which the algorithm is executed) can be set by the user of the system, or it can be preset.
- a range of threshold thermal values can be chosen - each of which provides a level of protection against unwanted corneal burns. For example, the highest threshold thermal value in the range can be set at a value that provides a small difference (e.g. one degree F) between the temperature at which the cornea burns and the threshold.
- a lower threshold thermal value can be set so that the difference between the temperature at which the cornea burns and the threshold is much greater (10 degrees F or so).
- the algorithm is executed when the calculated thermal value is above the threshold thermal value.
- the algorithm stops executing. In this manner, the algorithm turns on and off as the calculated thermal value exceeds and falls below the threshold thermal value.
- FIG. 5 is a block diagram of another embodiment of a control system according to the principles of the present invention.
- Figure 5 more clearly shows the algorithm in operation.
- CPU 1 16 calculates the calculated thermal value based on a reading from the irrigation pressure sensor 1 130, the power from the power source 120, and the estimated friction.
- CPU 1 16 acts like a PID controller (and instead of CPU 1 16, a PID controller or other similar type of controller can be used).
- the inverse of the scaled calculated thermal value is subtracted from the power to reduce the power applied to the hand piece.
- CPU 1 16 controls the output of power source 120 by decreasing the amount of power output by power source 120 by an amount that is inversely proportional to the calculated thermal value (or by an amount that is inversely proportional to the thermal value in excess of the threshold) - designated by xT - where x can be a scalar or a function.
- the power supplied to the hand piece is decreased in proportion to an amount that is in excess of the threshold thermal value.
- the calculated thermal value falls below the threshold thermal value, normal operation resumes.
- This implementation of the thermal watch algorithm can be set to run
- FIG. 6 is a graph depicting an exemplary operation of the thermal management algorithm in continuous mode according to the principles of the present invention.
- the top graph indicates calculated thermal value
- the bottom graph indicates power applied to the hand piece.
- the surgeon can apply continuous power to the hand piece. In this case, the surgeon applies 100% power to the hand piece. However, the surgeon can apply any power level by depressing the foot switch.
- the thermal watch algorithm In continuous mode, power is applied continuously to the hand piece while the foot pedal is depressed. The degree to which the foot pedal is depressed (or the position of the foot pedal) determines the amount of power or power level applied.
- the thermal watch algorithm overrides the surgeon's control of power. In this manner, the thermal watch algorithm acts to decrease the power in proportion to the temperature rise over the threshold thermal value. In other words, an incremental temperature increase over the threshold thermal value results in a proportional decrease in the amount of power applied to the hand piece.
- the decrease in power can be smooth as depicted in Figure 6. In this manner, a smooth decrease in power still results in power being applied smoothly to the cutting tip of the hand piece.
- the calculated thermal value will tend to decrease as well.
- the surgeon resumes control of power - in this case, power applied returns to 100%.
- Figure 7 is a graph depicting an exemplary operation of the thermal management algorithm in pulse mode according to the principles of the present invention.
- the top graph indicates calculated thermal value
- the bottom graph indicates power applied to the hand piece.
- pulse mode a series of fixed width pulses is applied to the hand piece.
- the surgeon controls the amplitude (or power level) of the pulses with the foot switch. In this manner, the position of the footswitch determines the power level of the pulses.
- the calculated thermal value is below the threshold thermal value
- the surgeon can apply any desired power to the hand piece. In this case, the surgeon applies 100% power to the hand piece.
- the thermal watch algorithm overrides the surgeon's control of power.
- the thermal watch algorithm acts to decrease the power in proportion to the temperature rise over the threshold thermal value.
- an incremental temperature increase over the threshold thermal value results in a proportional decrease in the amount of power applied to the hand piece.
- the decrease in power can be smooth as depicted in Figure 7.
- a smooth decrease in power still results in power being applied smoothly to the cutting tip of the hand piece.
- the thermal watch algorithm operates to decrease the power of any given pulse non-linearly. In this manner, the thermal watch algorithm operates on an individual pulse (or a series of pulses as the case may be).
- Figure 8 is a graph depicting an exemplary operation of the thermal management algorithm in pulse mode according to the principles of the present invention.
- the top graph indicates calculated thermal value
- the bottom graph indicates power applied to the hand piece.
- pulse mode a series of fixed width pulses is applied to the hand piece.
- the surgeon controls the amplitude (or power level) of the pulses with the foot switch. In this manner, the position of the footswitch determines the power level of the pulses.
- the calculated thermal value is below the threshold thermal value
- the surgeon can apply any desired power to the hand piece. In this case, the surgeon applies 100% power to the hand piece.
- the thermal watch algorithm overrides the surgeon's control of power.
- the thermal watch algorithm acts to decrease the power in proportion to the temperature rise over the threshold thermal value.
- an incremental temperature increase over the threshold thermal value results in a proportional decrease in the amount of power applied to the hand piece.
- the decrease in power can be incremental as depicted in Figure 8.
- an incremental decrease in power still results in power being applied to the cutting tip of the hand piece.
- the thermal watch algorithm operates to decrease the power of the next pulse while maintaining a constant pulse level. In this manner, the thermal watch algorithm operates on the next pulse and serves to limit the power level of that next pulse to a constant power level.
- Figure 9 is a graph depicting an exemplary operation of the thermal management algorithm in burst mode according to the principles of the present invention.
- the top graph indicates calculated thermal value
- the bottom graph indicates power applied to the hand piece.
- burst mode a series of pulses is applied to the hand piece.
- the surgeon controls the off time between pulses with the foot switch. In this manner, the position of the footswitch determines the off time between the pulses.
- the calculated thermal value is below the threshold thermal value
- the surgeon can apply any desired power to the hand piece. In this case, the surgeon applies 100% power to the hand piece.
- the thermal watch algorithm overrides the surgeon's control of power.
- the thermal watch algorithm acts to decrease the power in proportion to the temperature rise over the threshold thermal value.
- an incremental temperature increase over the threshold thermal value results in a proportional decrease in the amount of power applied to the hand piece.
- the decrease in power can be smooth as depicted in Figure 9.
- a smooth decrease in power still results in power being applied smoothly to the cutting tip of the hand piece.
- the thermal watch algorithm operates to decrease the power of any given pulse non-linearly. In this manner, the thermal watch algorithm operates on an individual pulse (or a series of pulses as the case may be).
- Figure 10 is a graph depicting an exemplary operation of the thermal management algorithm in burst mode according to the principles of the present invention.
- the top graph indicates calculated thermal value
- the bottom graph indicates power applied to the hand piece.
- burst mode a series of pulses is applied to the hand piece. The surgeon controls the off time between pulses with the foot switch. In this manner, the position of the footswitch determines the off time between the pulses.
- the calculated thermal value is below the threshold thermal value
- the surgeon can apply any desired power to the hand piece. In this case, the surgeon applies 100% power to the hand piece.
- the thermal watch algorithm overrides the surgeon's control of power.
- the thermal watch algorithm acts to decrease the power in proportion to the temperature rise over the threshold thermal value.
- an incremental temperature increase over the threshold thermal value results in a proportional decrease in the amount of power applied to the hand piece.
- the decrease in power can be incremental as depicted in Figure 10.
- an incremental decrease in power still results in power being applied to the cutting tip of the hand piece.
- the calculated thermal value will tend to decrease as well.
- the thermal watch algorithm operates to decrease the power of the next pulse while maintaining a constant pulse level.
- the thermal watch algorithm operates on the next pulse and serves to limit the power level of that next pulse to a constant power level.
- the power is decreased in proportion to a scalar factor of the temperature increase.
- the power is decreased in proportion to a function of the temperature increase.
- a minimum power level can be set. In this case, power will never fall below the minimum power level thus resulting in a continuous (albeit lower) application of power to the hand piece.
- the rate at which power is decreased can be changed. In this case, the power decrease can be made to be as smooth as desired. A smooth decrease in power results in more effective cutting (as power is applied continuously and not turned off) and better surgeon feel.
- the present invention provides a thermal management algorithm for phacoemulsification surgery.
- the present invention provides a control system that calculates a thermal value, compares the thermal value to a threshold thermal value, and reduces power supplied to the hand piece when the calculated thermal value exceeds the threshold thermal value.
- the present invention is illustrated herein by example, and various modifications may be made by a person of ordinary skill in the art.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/634,283 US8070711B2 (en) | 2009-12-09 | 2009-12-09 | Thermal management algorithm for phacoemulsification system |
PCT/US2010/058692 WO2011071744A1 (en) | 2009-12-09 | 2010-12-02 | Thermal management algorithm for phacoemulsification system |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2509550A1 true EP2509550A1 (en) | 2012-10-17 |
EP2509550B1 EP2509550B1 (en) | 2016-09-21 |
Family
ID=43598452
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10788463.7A Active EP2509550B1 (en) | 2009-12-09 | 2010-12-02 | Thermal management algorithm for phacoemulsification system |
Country Status (8)
Country | Link |
---|---|
US (1) | US8070711B2 (en) |
EP (1) | EP2509550B1 (en) |
JP (1) | JP5767241B2 (en) |
CN (1) | CN102652005B (en) |
AU (1) | AU2010328494B2 (en) |
CA (1) | CA2781141C (en) |
ES (1) | ES2606210T3 (en) |
WO (1) | WO2011071744A1 (en) |
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US20070191713A1 (en) | 2005-10-14 | 2007-08-16 | Eichmann Stephen E | Ultrasonic device for cutting and coagulating |
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- 2010-12-02 CN CN201080055619.2A patent/CN102652005B/en not_active Expired - Fee Related
- 2010-12-02 JP JP2012543161A patent/JP5767241B2/en active Active
- 2010-12-02 EP EP10788463.7A patent/EP2509550B1/en active Active
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- 2010-12-02 ES ES10788463.7T patent/ES2606210T3/en active Active
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See references of WO2011071744A1 * |
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EP2509550B1 (en) | 2016-09-21 |
WO2011071744A1 (en) | 2011-06-16 |
CA2781141C (en) | 2017-08-01 |
CA2781141A1 (en) | 2011-06-16 |
AU2010328494A1 (en) | 2012-06-14 |
US8070711B2 (en) | 2011-12-06 |
CN102652005A (en) | 2012-08-29 |
AU2010328494B2 (en) | 2015-06-11 |
JP2013513427A (en) | 2013-04-22 |
US20110137232A1 (en) | 2011-06-09 |
JP5767241B2 (en) | 2015-08-19 |
ES2606210T3 (en) | 2017-03-23 |
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